The process of isotopes breaking down and emitting particles, such as alpha or beta, to form a new substance.

The process is called as nuclear decay process.

Explanation:

Nuclear reaction are defined as the reactions in which nucleus of an atom is involved.

Isotopes under decay process in order to attain stability.

Unstable isotopes known as parent isotopes undergo various decay processes to form stable isotopes known as daughter isotopes.

The various decay processes are:

Hence, the process is called as nuclear decay process.

a. hope i'm right

explanation:

there is none because earth is stationary and flat.